@copy = @names; $size = @names;print"Given names are : @copy\n";print"Number of names are : $size\n";1234567 这将产生以下结果 - Givennamesare:John Paul Lisa Kumar Number ofnamesare:3123 这里@names是一个数组,已在两个不同的上下文中使用。 首先我们将它复制到任何其他数组,即list,所以它...
{print"two arrays are not equal\n"; }else{print"two arrays are equal\n"; } } my @a=(1,2,3,4,5); my @b=(1,2,3,4,5); &compare(\@a,\@b); 输出:two arrays are equal my @a=(1,2,3,4,5); my @b=(1,2,3,4,5,6); &compare(\@a,\@b); 输出:two arrays are ...
$x=10;$y=$x+20;# 30if($x==$y){print"Equal\n";}else{print"Not equal\n";} 5. 控制流语句 Perl中的控制流语句包括循环和条件分支等结构。 * For循环 – Perl提供了三种for循环方式,这里演示其中之一: for($i=0;$i<=10;$i++){print"Value of i: $i\n";} * while循环 - 当条件成立...
$n=1; if($n<0){ print "$n is a negative number.\n" } 语句修饰词 print "$n is a negative number.\n" if $n<0;#语句修饰词 条件修饰词: if ;unless 循环修饰词 :while ;until; foreach 4.循环控制 last:提前结束全部循环,等同于“break” next:提前进入到下一次循环,等同于“continue”...
if ($foo eq $baa) # $fooと$baaが等しければ (EQual) if ($foo ne $baa) # $fooと$baaが異なっていれば (Not Equal) if ($foo lt $baa) # $fooが$baaより辞書順に小さければ (Less Than) if ($foo gt $baa) # $fooが$baaより辞書順に大きければ (Greater Than) if ($foo ...
next if (not $i %2); print "An odd number=$i\n"; } === 退出perl exit语句是最后的一个流控制工具。当perl遇到exit语句时,程序就停止执行,perl 将一个退出状态返回给操作系统。 if ($user eq 'quit') { print "Good bye\n"; exit 0; }...
Remember that the width of the VARCHAR column # is the number of bytes set aside to store strings, which often does not equal # the number of characters it can hold when it comes to Unicode! $dbh->do("CREATE TABLE test( C_VARCHAR VARCHAR(100) )"); print OUTFILE "Inserting data.....
Password for 'https://userName@gitee.com': # 私人令牌 openkylin/yangtze 分支(4) 标签(2) 管理 管理 openkylin/yangtze packaging/openkylin/yangtze pristine-tar upstream debian/5.30.0-ok1 upstream/5.30.0 perl / pp_ctl.c pp_ctl.c 158.66 KB ...
Duplicate a file descriptor to the number specified in the third argument to C<fcntl> (if it refers to an open file, it is automatically closed first). =item C<F_DUPFD> Duplicate a file descriptor to the lowest unused number greater than or equal to the third argument of C<fcntl>. ...
() not yet implemented, Global state maintained by XSUBs, Interpreter embedded in larger application, Thread-safety of extensions BUGS AUTHOR SEE ALSO perlnumber - semantics of numbers and numeric operations in Perl perl v5.12.5 Last change: 2014-06-17 37 Perl Programmers Reference Guide PERLTOC...